H-D-Asp-OBzl

H-D-Asp-OBzl is a benzyl ester derivative of D-aspartic acid, featuring a chiral, β-carboxyl-bearing amino acid framework with the α-amino group presented as the free amino (H-D-) and the carboxyl functionality converted to an OBzl ester. The molecule contains a stereogenic center at the α-carbon and a second side-chain carboxyl group protected as a benzyl ester, which modulates polarity, peptide-coupling behavior, and orthogonality during multi-step synthesis. The benzyl ester can be selectively removed under hydrogenolysis conditions, enabling controlled exposure of the side-chain carboxyl for subsequent amidation, esterification, or salt formation. The D-configuration supports stereochemically defined incorporation into peptide sequences and as a chiral intermediate for aspartate-based derivatization and downstream functional-group transformations.

1. Peptide Synthesis

H-D-Asp-OBzl is applied in peptide building workflows where aspartate-derived residues require side-chain carboxyl protection to prevent competing acylation during amide bond formation. The protected β-carboxyl as OBzl provides a stable handle that can remain intact through coupling steps, while the free α-amino group participates in standard peptide coupling chemistry to form N-terminal or internal peptide bonds. Benzyl ester deprotection after chain assembly can regenerate the side-chain carboxyl for subsequent peptide elaboration, cyclization, or salt-state tuning. D-aspartate stereochemistry enables access to peptide analogs with defined inversion at the aspartate center for structure-activity relationship studies and stereochemical mapping of peptide recognition.

2. Side-Chain Functionalization

H-D-Asp-OBzl is suitable for side-chain functionalization strategies that convert the aspartate β-carboxyl into amide, ester, or activated acyl intermediates after controlled benzyl ester cleavage. The OBzl group provides a protecting-group strategy that suppresses premature reactivity of the carboxyl during earlier manipulations, while the amino functionality supports selective derivatization sequences that can be orthogonal to side-chain activation. Regenerated D-aspartate carboxyl can be employed for conjugation handles, including formation of peptide-like linkages to ligands or incorporation into constrained scaffolds. The stereodefined D-aspartate framework can be used to generate stereochemically consistent derivatives for chemical biology probes and peptidomimetic construction.

3. Chiral Amino Acid Intermediate

H-D-Asp-OBzl functions as a chiral amino acid intermediate in fine chemical synthesis where D-aspartate stereochemistry must be preserved through protection, activation, and downstream conversion. The benzyl ester establishes a controllable physicochemical profile that can improve handling and compatibility with coupling reagents, while the free amino group enables conversion into activated derivatives, such as further protected amino acid formats or coupling-ready species. Sequential deprotection and refunctionalization allow stepwise access to D-aspartate derivatives bearing different side-chain substituents, including carboxylates, amides, and ester-linked motifs. The compound's stereochemical integrity makes it appropriate for manufacturing route design of aspartate-based intermediates used in peptide analog libraries and process chemistry intermediate preparation.

4. Bioconjugation Chemistry

H-D-Asp-OBzl can be used in bioconjugation chemistry workflows that require a defined aspartate-derived linker unit with controlled side-chain carboxyl availability. The benzyl ester protection enables temporary masking of the β-carboxyl to avoid uncontrolled coupling to biomolecule nucleophiles during preparation of conjugation reagents or linker scaffolds. Hydrogenolysis-mediated unmasking can then generate the D-aspartate carboxyl for coupling to amines, hydrazides, or other nucleophilic partners, supporting formation of stable amide-containing conjugates. D-configuration can be leveraged to tune linker stereochemistry in chemical biology research materials, including peptide-based probes and biomolecule modification reagents.

5. Pharmaceutical Manufacturing

H-D-Asp-OBzl is relevant to pharmaceutical manufacturing contexts involving peptide intermediate preparation and controlled protection-group strategies for aspartate-containing sequences. The OBzl ester provides a practical protecting-group element that can survive multiple synthetic steps and can be removed to expose the side-chain carboxyl at a defined stage of assembly. The free amino functionality supports incorporation into peptide fragments and enables downstream conversion into carboxyl-derivatized intermediates used for formulation-relevant salt forms or further functionalization. D-aspartate stereochemistry supports consistent synthesis of stereodefined peptide analogs and process chemistry intermediate generation for manufacturing-scale peptide construction.

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